* feat(assets): redesign search result UI with heading, tags, categories and collections
- Add heading/anchor display for anchorified search results (inline in title row)
- Add tags, categories, collections display in search result metadata row
- Extend SearchResult interface with optional heading, tags, categories, collections
- Pass metadata through all search engines (Fuse.js, Algolia, Pagefind)
- Add search-specific render hooks to eliminate replaceRE hacks:
- render-heading.search.json: clean heading output without class/span
- render-codeblock.search.json: code output without line numbers
- fixit-encryptor.search.json: skip encrypted content in search index
- Add data-pagefind-ignore="all" to fixit-encryptor for Pagefind exclusion
- Add data-pagefind-meta for tags, categories, collections in Pagefind
- Add data-pagefind-sort for title (alphabetical sorting)
- Extend PagefindConfig.sortBy to support "title" option
- Redesign search modal SCSS with flex layout for title/heading/date row
- Add .suggestion-meta row with icon-styled tags/categories/collections
* feat(layouts): add Bing Custom Search Engine support
- Implement Bing CSE adapter in search engine (redirect to results page)
- Add Bing CSE widget embed in search page template via JavaScript snippet
- Update CSE engine warning message to be provider-agnostic
- Add Bing icon (fa-microsoft) for Bing CSE results
- Add cx config field for Bing and mark as unverified
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